There is no need for keeping a special diff page for the mobile version. It can be removed and redirected to pages with &diff= parameter. We can at least get rid of Special:MobileDiff in Advanced Mobile Contributions mode and redirect the page to a page with diff parameter just like in desktop. We do the same for history page in AMC mode.
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This is tracked in T117279.
The plan is to eventually remove Special:MobileDiff, but the functionality is essential for mobile so we need to fold it into core (and the desktop diffs page) first.